It's not natural, regardless of what the manufacturer would like you to believe. It's processed the f--- from the natural stevia leaf. I don't have a problem with that, I use artificial sweeteners myself, but I just hate its claim to be sooooo good for you. Different people react differently to artificial sweeteners. That's my best guess. It's certainly no better than aspartame, ducts lose, etc, in my book. Your body knows it's not getting a healthy product and will react accordingly.
F 28/5'4/100 lbs
"I'm not a psychopath, I'm a high-functioning sociopath; do your research."